Source : Webster's Revised Unabridged Dictionary (1913)

Campion \Cam"pi*on\, n. [Prob. fr. L. campus field.] (Bot.)
   A plant of the Pink family ({Cucubalus bacciferus}), bearing
   berries regarded as poisonous.

   {Bladder campion}, a plant of the Pink family ({Cucubalus
      Behen} or {Silene inflata}), having a much inflated calyx.
      See {Behen}.

   {Rose campion}, a garden plant ({Lychnis coronaria}) with
      handsome crimson flowers.

Source : WordNet®

bladder campion
     n 1: perennial of arctic Europe having large white flowers with
          inflated calyx [syn: {Silene uniflora}, {Silene vulgaris}]
     2: bluish-green herb having sticky stems and clusters of large
        evening-opening white flowers with much-inflated calyx;
        sometimes placed in genus Lychnis [syn: {white campion}, {evening
        lychnis}, {white cockle}, {Silene latifolia}, {Lychnis
        alba}]